Derivatives of dimercapto-pyrazines



United States Patent 3,164,594 DERIVATIVES 0F DIMERCAPTO-PYRAZINES Karlfried Dickore, Leverkusen, Klaus Sasse, Cologne- Stammheim, and Richard Wegler, Leverkusen, Germany, assignors to Farbenfabriken Bayer Aktiengesellschaft, Leverkusen, Germany, a corporation of Germany No Drawing. Original application Nov. 21, 1961, Ser. No. 154,059. Divided and this application Dec. 12, 1963, Ser. No. 338,544 Claims priority, application Germany Nov. 20, 1960 6 Claims. (Cl. 260-250) The present invention relates to and has as its objects new and useful insecticidal, acaricidal and partially fungicidal compounds and processes for the production thereof. The new compounds of this invention may be represented by the following general formula wherein Z denotes a bridge of one or two carbon atoms or of one carbon atom and/ or one nitrogen atom, which all may be further substituted, and in which R stands for a shared acyl radical or two separate acyl radicals.

From U.S. pat. appl. Serial No. 823,825 filed June 30, 1959 there are known acylation products of 2.3- dimercapto-quinoxalines with very good acaricidal properties.

In accordance with the present invention it has now been found that the inventive compounds of good acaricidal activity are obtained by the reaction of mononuclear heterocyclic o-dimercapto compounds of the general formula in which Z has the above said significance, with inorganic or organic acid halides, acid anhydrides, isocyanates or thio-isocyanates.

In addition to the activity of the above mentioned quinoxalines, the compounds according to the invention, surprisingly, also possess excellent insecticidal properties. Harmful insects such as fly maggots, grain weevils or cockroaches are effectively destroyed by the new compounds according to the invention.

The reaction of the aforesaid dimercapto compounds with monofunctional acid halides or anhydrides leads to products which contain the acid radical once or twice.

Suitable acid halides are for example (thio)-carboxylic acid halides, chloroformic acid esters, thiocarbonic acid ester halides, sulfenic acid halides, sulfinic acid halides, sulfonic acid halides, carbamic acid halides, chlorosulfonic acid esters or chlorosulfonic acid halides. Bifunctional acid halides such as phosgene, thiophosgene, thionyl chloride or sulfuryl chloride lead to binuclear heterocyclic compounds.

The production of the new substances according to the invention is carried out by methods known in principle. For example, the said dimercapto compounds can be reacted in an aqueous solution or in admixture with water-miscible or -immiscible organic solvents, with less moisture-sensitive acid halides in the presence of an acidbinding substance. Water sensitive acid halides are expediently reacted with the dimercapto compounds in an inert organic solvent such as hydrocarbons, dioxan, acetone, in the presence of an acid-binding agent. Working 3,164,594 Patented Jan. 5, 1965 "ice up of the reaction mixtures is carried out by methods commonly applied in organic chemistry.

As examples for the special utility of the inventive compounds the cyclic trithiocarbonates of the following formulae N s H30 |L o=s 30- N/ s/ have been tested against spider mites.

Aqueous emulsions of the aforementioned compounds have been prepared by admixing them with the same amount of an auxiliary solventtaceton). A commercial emulsifier (benzyl hydroxy diphenyl polyglycol ether) is added in an amount of 20% referred to active ingredient. This premixture is diluted with water to the desired concentration. The test has been carried out as follows:

(Contact-insecticidal action): Bean plants (Phaseolus vulgaris) of about 15 inches height are sprayed drip wet with solutions as prepared above in a concentration as shown below. The bean plants have been infested heavily with the two-spotted spider (species Tetranychus telarius) Evaluation has been carried out after 24 hours, 48 hours and 8 days. The following results have been obtained: With compound I spider mites (Tetranychus telarius) are killed completely with 0.1% solutions within 48 hours. With compound II spider mites of the type Euproctis chrysorrhoea are killed completely with 0.02% solutions and spider mites of the type Tetranychus telarius are killed to with 0.02% solutions.

The following examples are given for the purpose of illustrating the invention:

Example 1 S-COOCH;

of MP. 58 to 63 C.

By the same way there may be obtained the compounds of the following formulae:

S-S O 0 C2115 N 5 6 We claim: 3. A compound of the formula 1. A compound of the formula 0 N v S--(I.I}-N(CH3)2 111-0 0-s-n; 5 S C N(CHJ)I Rz- S-B3 N/ g N p 4. A compound of the formula wherein R and R are members selected from the group 10 N consisting of hydrogen and lower alkyl and R is a mem ber selected from the group consisting of and III

S-C O 0 CH3 SCOOC a s-o-ooin N l 5. A compound of the formula No references cited. 

1. A COMPOUND OF THE FORMULA 